A capacitor C is connected in series with a resistor R across a battery and an open switch. If a second capacitor of capacitance 2C is connected in parallel to the first, the time constant of the new RC circuit will be the same as before. one-fourth as large as before.

b. About how many time constants does it take to charge a capacitor in an RC circuit to 50% of its maximum value?

A simple RC circuit has a switch, a resistor (R), and a capacitor (C) all wired together in series. Assuming the switch is open initially and capacitor is fully charged to a potential V and holds a charge Qo, which of the following expressions describes the current through the circuit at time t=RC after the switch is closed? I = Ve R Selected Answer: V² Answers: I RC I = V R.e I = RC·e V %3D

The duration of a photographic flash is related to an RC time constant, which is 0.12 us during the flash discharge for a certain camera. td = 0.12 us R = 0.048 ohm (a) If the resistance of the flash lamp is 0.048 ohm during discharge, what is the size of the capacitor supplying its energy in uF? (b) What is the time constant for charging the capacitor, if the charging resistance is 800.0 kOhm in s?

Suppose one wished to capture the picture of a bullet (moving at 5.0 X 102 m/s) that was passing through an apple. The duration of the flash is related to the RC time constant, τ . What size capacitor would one need in the RC circuit to succeed, if the resistance of the flash tube was 10.0 Ω ? Assume the apple is a sphere with a diameter of 8.0 x 10-2 m.